Witnesses say up to six ambulances have gone into the station although there are no reports of any injuries at the moment.

There are delays in both directions on the M62 near Castleford.

We understand police are now closing some roads so it would be advisable to avoid the area.

3:59 pm

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Black smoke coming from the fire is visible from some distance.

4:02 pm

SSE which runs the power station says a "serious incident" occurred at Ferrybridge at around 2pm this afternoon.

Here's a statement in full: "At around 2pm today a serious incident occurred at SSE's Ferrybridge C power station in West Yorkshire.

"The Company's practised emergency response procedures have been activated. West Yorkshire Fire and Rescue Service are in attendance and dealing with the incident with assistance from expert engineers on site. All employees have been accounted for.

"It is too early to give any more information regarding this incident; however, we will issue a further statement when more details become available.

"Our immediate priorities are to deal with the incident and to ensure the safety of staff, contractors and the general public."

4:06 pm

West Yorkshire Fire Service says all persons are accounted for and there are not believed to be any casualties at Ferrybridge.

The number of pumps at the blaze has been escalated from 10 to 15.

Firefighters have been called in from the surrounding stations of Pontefract, Normanton, Featherstone, Castleford and Wakefield.

The service say the blaze started on the third floor of a four-storey building.

An update from SSE - the company says it has launched an investigation to find out how the fire started.

Here's the statement: "At around 2.00pm today a serious fire impacted Units 3 and 4 of SSE's Ferrybridge C power station in West Yorkshire.

"All persons on site have been accounted for and there are no reported injuries.

"The Company's practised emergency response procedures were immediately activated and we are currently in the process of ensuring the site is made secure and safe.

"The affected area in the site vicinity has been isolated by police and the West Yorkshire Ambulance Service hazardous area response team are also present. West Yorkshire Fire and Rescue Service remains in attendance and is dealing with the incident with support from SSE engineers.

"West Yorkshire Fire and Rescue Service has indicated the fire is now being brought under control. Due to planned maintenance neither of the affected units had been operational over the summer and therefore had not been supplying power to the National Grid at the time of today's incident.

"SSE will be undertaking an investigation to establish the full extent of damage in due course. Early indications show the fire itself started in unit 4 but also had some impact on Unit 3.

"Currently we do not expect Unit 4 to return to service in this financial year. Unit 3 is not expected to return to service before 1 November. Our immediate priority is to manage the incident and to ensure the safety of staff, contractors and the general public."